Chill for castings



Aug- 18 1931- G. c. BUMBAUGH CHILL FOR CASTINGS Filed May 4, 1928Patentednug. 1s, 1931 UNITED STATES PATENT oFFIci:

GEORGE C. BUMBAUGH, OF CANTON, OHIO, ASSIGNOR OF ONE-HALF TO J. S.MCOORHICK COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA CHILL FOR CASTINGS Application led May 4,

This invention relates to foundry practice and more particularly tomeans adapted to be located in the mold for chilling certain portions ofthe molten metal to prevent cracks,

5 pipes or the like from being formed as the casting cools.

In the casting of articles in which a thin part such as a web or rib isassociated with a boss, hub or the like, it is well known that lo themetal adjacent to the juncture of the rib and boss cools more slowlythan the metal formingthe rib.

This causes pipes or cracks to form in the casting at this point,forming a defect which often causes the loss ofthe casting.

In order to overcome such defects, it is common practice for the melderto place nails or the like in the sand, protruding into the mold atsuchpoints, in order to more rapidly cool the metal at these places andprevent the formation of cracks, pipes or the like in the casting.

' Such methods are not entirely satisfactory and require considerablework andskill in properly placing the nails. or the like in the sand.

The object of the present improvementis to provide a chill formed ofwire, of suitable gauge, bent into spiral orA helical shape and providedwith a straight projection adapted to be inserted into the sand to holdthe chill in proper position when the molten metal is poured into themold.

When the molten metal is poured into the mold this chill-will be incontact with the portions of the metal adjacent to the points whichordinarily cool the slowest and will thus speed up the cooling of thisportion of the metal, preventing the formation of pipes or cracks in thecasting.

The wire or rod forming this chill may be of any desired metal,depending upon the nature of the metal being cast and as the be fusedand will form an integral part of vshown in Fig. 1, the chill beingshown in same contacts with the molten metal, it will.,

1928. Serial No. 275,018.

trated in the accompanying drawings, in which Figure 1 is a fragmentaryplan view of a portion of a casting comprising a boss andy a pluralityof ribs' or webs connected thereto, the position of the chill devicebeing indicated in dotted lines;

Fig. 2 a vertical sectionalview through a sand mold adapted for castingthe article position therein;

Fig. 3 a detache'd perspective view of the form of chill shown in Figs.1 and 2; and

Fig. 4 a perspective view of a modication ofthe device.

Similar numerals refer to similar parts throughout the drawings.

For the purpose of illustrating the use of the improved chill, a portionof a casting is illustrated in Fig. 1, comprising a boss or hub 1 towhich are connected several ribs or webs 2.

In the casting of such articles, it is well known that the metal in thecasting adjacent to the juncture of each rib or web with the hub or bosscools more slowly than the metal forming :the ribs or webs and as aresult thereof, pipes or cracks are formed at the juncture of the riband boss. In order to overcome this condition, the present improvementlis provided to more rapidly cool the metal at such points and thusprevent this formation of pipes or cracks in the casting.

The `chill may' be in the form of a coil 3 of wire of suitable size andmaterial hav- -ing one end' thereof turned inward'toward the center asshown at 4 and then extended axially through and `beyond the coil as at5, forming a tail or stem which may be inserted into the sand 6 of themold as shown in Fig. 2. l

With the chill in this position, it will be seen that the coil extendsaround the boss or hub, near the periphery thereof, and ad-` jacent tothe junctures of the ribs or'webs with the hub.v

When the molten metal is poured into the mold, the chill will rapidlycool the metal adjacent to these junctures, preventing the formation ofpipes or cracks at these points, and thus overcomin the diiicultiesexperienced in castin artic es of this kind.

This chill will be used and form a solid part of the finished casting,and after the same is removed from the sand, the tail or stem 5 may besheared oi.

It should be understood that this is only one application of the deviceand that many sizes and proportions of the coil may be formed of variousthicknesses of wire to adapt the device to different shapes and sizes ofcastings.

In Fig. 4 is shown one modification of the chill in which the wire isbent into a helical form as at 7 and provided with the axial tail orstem 8 for insertion into the sand of the mold.

Such a device is especialllyl casting of flat articles su and the like.

From the above, it will be seen that a simple and inexpensive device isprovided which may be easily and readily placed in position in the moldto overcome the diiiiculties in casting above pointed out.

I claim:

1. A 'chill for casting comprising a metal adapted for the as valveplates spiral coil adapted to be placed in a mold and having a tailportion for insertion into the sand of the mold.

2. A chill for casting comprising a metal spiral coil adapted to beplaced in a mold and having an axial tail portion for insertion into thesand of the mold.

3. A chill for casting comprising a metal helical spiral coil adapted tobe placed in a mold.

4. A chill for casting comprising a metal helical spiral coil adapted tobe laced in a mold and having a tail portion or insertion into the sandof the mold.

5. A chill for casting comprising a metal helical spiral coil adapted tobe placed in a mold'and having an axial tail portion for insertion intothe sand 0f the mold.

In testimony that I claim the above, I have hereunto subscribed m name.

GEORGE C'. UMBAUGH.

